The initial dye concentration was varied in order to check its influence on the percentage of dye extraction. The dye solutions with different initial concentrations in the range 30– 100 mg/l were tested under constant conditions. Fig. 6 shows that the percentage dye extracted decreases from 100% to 78% as the initial concentration increases from 30 to
100 mg/l. The decrease in extraction with increase initial dye concentration can be explained by the fact that at higher dye
concentration, the limited extractant in the solution cannot react with the excess dye [42]. The decrease in percentage dye
removal with increasing initial dye concentration may beattributed to the tendency of dye molecules to associate and
form aggregates of low diffusivity with increasing initial dye concentration [43], and this reduces the rate of dye extraction
which is a diffusion controlled process